Digital Counter / Timer / Tachometer (CTT Series)
The CTT series from Automation Direct are multi-function digital units. They incorporate a multi-function digital counter, timer and tachometer all within the same unit. This means that you have fewer stock items and the learning curve is minimized. The CCT series are easily configured as a digital counter, timer, combination timer-counter or tachometer.
The two colour LCD display shows present values, setting values and menu parameters during setup. Process control parameters are easily set using the externally accessible DIP switches or the lockable keypad. We will be looking at this versatile multi-fictional device. Let’s get started. Continue Reading!
The productivity series of PLCs has a Drum and Sequencer instruction.
Drum instructions are great tools. They mimic an electromagnetically drum sequencer. Have you ever seen the mechanisms of a music box? Ok so it’s a little drum with pegs that catch and flick the chimes in a particular sequence to play whatever tune is on the drum. So in the PLC you can have a drum driven by an event, (input from a limit switch or button), or by time.
Sequencers are similar to the drum instruction. The sequencer output can have up to 16 Boolean, Integer or Numerical Tags per step. Drum instruction outputs are limited to the same 16 bit (Boolean) outputs. Each step in the sequencer can be defined by time or /and event and specified outputs can be set going into and out of the step.
We have done similar Drum instructions for the BRX Series PLC and the Click PLC.
BRX PLC Drum Instruction – Video
Click PLC Drum Instruction – Video
We will be discussing the drum and sequencer instructions in the Productivity Series PLC. Simple examples will be done to demonstrate the power of these instructions. Let’s get started. Continue Reading!
The C-More Micro HMI Panel software uses virtual components called Objects. These objects are programmable to simulate the functions that you require on your automation project. Several of these objects can be placed on one panel screen and you can have multiple panel screens. This helps you produce simple, intuitive looking human machine interfaces.
Continuing from last time we will now look at the numeric entries that we can use with our HMI micro panel. Let’s get started. Continue Reading!
Shift registers will move (shift) bits in a word (register) to the left or right.
If we look at an example of boxes moving along a conveyor belt, the boxes would represent the bits in the register. The movement of the conveyor would be the shifting of the register that represents the movement of the boxes.
Shift registers are a form of sequential logic, which involves the present inputs and the prior history. All of the prior history is remembered.
We will be making a shift register in PLC Fiddle with the instructions provided. The output of the shift register will then be looked at for a reject area. Let’s get started. Continue Reading!